I copied this from another site and I do own a non-sfi diaper also.
Ok 2008 rule book....you read the ET section under "oil retention device" its says any vehichle "permitted" to run one see general regulations 1.8...SOOO...you go to General Regualtion 1.8 and all it does is lay out the spec for the device...it doesnt say a word about what vehicles are "permitted" to run one....and exaclty what does "permitted" mean here??? Does permitted mean its an OPTION???(I know it doesnt but it reads that way)
OK....just spoke to the Head Div 3 tech....here is the deal...they are "permitted" meaning you can CHOOSE to run one....BUT they are NOT REQUIRED on non advanced ET cars.
They ARE required on S/G, S/C, ADv ET...etc...
So the 9.99 rumor is NOT true.